Which of the following are covered by a single membrane?

Draw a neat diagram of a plant cell and label any three parts which differentiate it from an animal cell.

State whether the following statement is true or false:
$RER$ looks smooth under a microscope because it has particles called ribosomes attached to its surface.

State the reason for the following:
$(i)$ Mitochondria are known as the powerhouse of the cell.
$(ii)$ Plastids are able to make their own protein.
$(iii)$ Plant cells shrink when kept in a hypertonic solution.

What is the role of smooth endoplasmic reticulum in the liver cells of vertebrate animals?

Lipid molecules in the cell are synthesized by: